GSXftw
10+ Year Contributor
- 381
- 78
- Dec 16, 2009
-
Medford,
Oregon
So let me start by saying this isnt my car, and Im really glad its not . Thing is a total abortion by the PO, needs his tools confinscated. Customer brought it in with a few issues, it had a P0335B DTC (crank position sensor circuit failure)...the code is thrown immediately, before you even start it just key on. I took one look at the wiring at the sensor and replaced the CkPS, it actually had those yellow wire nuts you use on house wiring twisting wires together and shit. After replacing CkPS, no change, the code is still thrown. This is a 95 Talon TSI AWD. Now the weird part. When you get the engine to a certain position, you get a phantom tach signal. The tach shows a steady 3400 RPM, KOEO (key on engine off) and the coils fire at the 3400rpm rate, but the ECU and scanner doesnt show this signal, all is normal on that side, its getting a phantom signal on the ignitor/ECU side. Tried a different igniter, no change, I checked wavelenths of the crank/cam postion sensors, all is normal there, nothing erratic, car starts/runs, just breaks up anywhere after 3k. During this 3400 phantom signal, there is not any wavelengths coming from either the CPS, or the CkPS, you can even unplug them both and the tach stays the same, the tach wire on the igniter however shows 110hz. The engine wiring looks okay, the car does have a turbo timer and an alarm, with a shitload of skotchlocks, exposed wires, and everything else I dont wanna try and make sense out of. Any Ideas where this phantom tach signal could be coming from that could give this signal? Thanks guys